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RotateTransform Class

Rotates an object clockwise about a specified point in a 2-D x-y coordinate system.

Namespace:  System.Windows.Media
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

'Declaration
Public NotInheritable Class RotateTransform _
	Inherits Transform
<RotateTransform .../>

The RotateTransform type exposes the following members.

  NameDescription
Public methodRotateTransformInitializes a new instance of the RotateTransform class.
Public methodRotateTransform(Double)Initializes a new instance of the RotateTransform class that has the specified angle, in degrees, of clockwise rotation. The rotation is centered on the origin, (0,0).
Public methodRotateTransform(Double, Double, Double)Initializes a new instance of the RotateTransform class that has the specified angle and center point.
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  NameDescription
Public propertyAngleGets or sets the angle, in degrees, of clockwise rotation.
Public propertyCanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
Public propertyCenterXGets or sets the x-coordinate of the rotation center point.
Public propertyCenterYGets or sets the y-coordinate of the rotation center point.
Public propertyDependencyObjectTypeGets the DependencyObjectType that wraps the CLR type of this instance.  (Inherited from DependencyObject.)
Public propertyDispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public propertyHasAnimatedPropertiesGets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties. (Inherited from Animatable.)
Public propertyInverseGets the inverse of this transform, if it exists. (Inherited from Transform.)
Public propertyIsFrozenGets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)
Public propertyIsSealedGets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
Public propertyValueGets the current rotation transformation as a Matrix object. (Overrides Transform.Value.)
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  NameDescription
Public methodApplyAnimationClock(DependencyProperty, AnimationClock)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public methodApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public methodCheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public methodClearValue(DependencyProperty)Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)
Public methodClearValue(DependencyPropertyKey)Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)
Public methodCloneCreates a modifiable copy of this RotateTransform by making deep copies of its values.
Public methodCloneCurrentValueCreates a modifiable copy of this RotateTransform object by making deep copies of its values. This method does not copy resource references, data bindings, or animations, although it does copy their current values.
Public methodCoerceValueCoerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject.)
Public methodEqualsDetermines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
Public methodFreezeMakes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)
Public methodGetAnimationBaseValueReturns the non-animated value of the specified DependencyProperty. (Inherited from Animatable.)
Public methodGetAsFrozenCreates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Public methodGetCurrentValueAsFrozenCreates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Public methodGetHashCodeGets a hash code for this DependencyObject. (Inherited from DependencyObject.)
Public methodGetLocalValueEnumeratorCreates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
Public methodInvalidatePropertyRe-evaluates the effective value for the specified dependency property (Inherited from DependencyObject.)
Public methodReadLocalValueReturns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
Public methodSetCurrentValueSets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)
Public methodSetValue(DependencyProperty, Object)Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)
Public methodSetValue(DependencyPropertyKey, Object)Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)
Protected methodShouldSerializePropertyReturns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject.)
Public methodToStringCreates a string representation of this GeneralTransform. (Inherited from GeneralTransform.)
Public methodToString(IFormatProvider)Creates a string representation of this instance, based on the passed IFormatProvider parameter. (Inherited from GeneralTransform.)
Public methodTransformTransforms the specified point and returns the result. (Inherited from GeneralTransform.)
Public methodTransformBoundsTransforms the specified bounding box and returns an axis-aligned bounding box that is exactly large enough to contain it. (Inherited from Transform.)
Public methodTryTransformAttempts to transform the specified point and returns a value that indicates whether the transformation was successful. (Inherited from Transform.)
Public methodVerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
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  NameDescription
Public eventChangedOccurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)
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  NameDescription
Public fieldStatic memberAnglePropertyIdentifies the Angle dependency property.
Public fieldStatic memberCenterXPropertyIdentifies the CenterX dependency property.
Public fieldStatic memberCenterYPropertyIdentifies the CenterY dependency property.
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  NameDescription
Explicit interface implemetationPrivate methodIFormattable.ToStringFormats the value of the current instance using the specified format. (Inherited from GeneralTransform.)
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A RotateTransform rotates an object by a specified Angle about the point CenterX, CenterY.

When you use a RotateTransform, realize that the transformation rotates the coordinate system for a particular object about the point (0, 0). Therefore, depending on the position of the object, it might not rotate in place (around its center). For example, if an object is positioned 200 units from 0 along the x-axis, a rotation of 30 degrees can swing the object 30 degrees along a circle that has a radius of 200, which is drawn around the origin. To rotate an object in place, set the CenterX and CenterY of the RotateTransform to the center of the object to rotate.

Freezable Features: Because it inherits from the Freezable class, the RotateTransform class provides several special features: RotateTransform objects can be declared as resources, shared among multiple objects, made read-only to improve performance, cloned, and made thread-safe. For more information about the different features provided by Freezable objects, see Freezable Objects Overview.

This example shows how to rotate an object. The example first creates a RotateTransform and then specifies its Angle in degrees.

The following example rotates a Polyline object 45 degrees about its upper-left corner.

<Canvas Height="200" Width="200">

  <!-- Rotates the Polyline 45 degrees about the point (0,0). -->
  <Polyline Points="25,25 0,50 25,75 50,50 25,25 25,0" 
    Stroke="Blue" StrokeThickness="10"
    Canvas.Left="75" Canvas.Top="50">
    <Polyline.RenderTransform>
      <RotateTransform CenterX="0" CenterY="0" Angle="45" />
    </Polyline.RenderTransform>
  </Polyline>
</Canvas>
			' Create a Polyline.
			Dim polyline1 As New Polyline()
			polyline1.Points.Add(New Point(25, 25))
			polyline1.Points.Add(New Point(0, 50))
			polyline1.Points.Add(New Point(25, 75))
			polyline1.Points.Add(New Point(50, 50))
			polyline1.Points.Add(New Point(25, 25))
			polyline1.Points.Add(New Point(25, 0))
			polyline1.Stroke = Brushes.Blue
			polyline1.StrokeThickness = 10

			' Create a RotateTransform to rotate
			' the Polyline 45 degrees about its
			' top-left corner.
			Dim rotateTransform1 As New RotateTransform(45)
			polyline1.RenderTransform = rotateTransform1

			' Create a Canvas to contain the Polyline.
			Dim canvas1 As New Canvas()
			canvas1.Width = 200
			canvas1.Height = 200
			Canvas.SetLeft(polyline1, 75)
			Canvas.SetTop(polyline1, 50)
			canvas1.Children.Add(polyline1)

The CenterX and CenterY properties of the RotateTransform specify the point about which the object is rotated. This center point is expressed in the coordinate space of the element that is transformed. By default, the rotation is applied to (0,0), which is the upper-left corner of the object to transform.

The next example rotates a Polyline object clockwise 45 degrees about the point (25,50).

<Canvas Height="200" Width="200">

  <!-- Rotates the Polyline 45 degrees about the point (25,50). -->
  <Polyline Points="25,25 0,50 25,75 50,50 25,25 25,0" 
    Stroke="Blue" StrokeThickness="10"
    Canvas.Left="75" Canvas.Top="50">
    <Polyline.RenderTransform>
      <RotateTransform CenterX="25" CenterY="50" Angle="45" />
    </Polyline.RenderTransform>
  </Polyline>
</Canvas>
			' Create a Polyline.
			Dim polyline2 As New Polyline()
			polyline2.Points = polyline1.Points
			polyline2.Stroke = Brushes.Blue
			polyline2.StrokeThickness = 10

			' Create a RotateTransform to rotate
			' the Polyline 45 degrees about the
			' point (25,50).
			Dim rotateTransform2 As New RotateTransform(45)
			rotateTransform2.CenterX = 25
			rotateTransform2.CenterY = 50
			polyline2.RenderTransform = rotateTransform2

			' Create a Canvas to contain the Polyline.
			Dim canvas2 As New Canvas()
			canvas2.Width = 200
			canvas2.Height = 200
			Canvas.SetLeft(polyline2, 75)
			Canvas.SetTop(polyline2, 50)
			canvas2.Children.Add(polyline2)

The following illustration shows the results of applying a Transform to the two objects.

Two objects that rotate 45 degrees from different rotational centers

45 degree rotations with different center points

The Polyline in the previous examples is a UIElement. When you apply a Transform to the RenderTransform property of a UIElement, you can use the RenderTransformOrigin property to specify an origin for every Transform that you apply to the element. Because the RenderTransformOrigin property uses relative coordinates, you can apply a transformation to the center of the element even if you do not know its size. For more information and for an example, see How to: Specify the Origin of a Transform by Using Relative Values.

For the complete sample, see 2-D Transforms Sample.

More Code

How to: Make an Element Spin in PlaceThis example shows how to make an element spin by using a RotateTransform and a DoubleAnimation.
How to: Rotate an Object by Using a Geometric PathThis example shows how to rotate (pivot) an object along a geometric path that is defined by a PathGeometry object.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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